#!/bin/sh
# Exercise chdir-long's sample main program.

# Copyright (C) 2005-2018 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.


# FIXME: add traps and choose top level names so that
# temporary directories are easier to remove.
# FIXME: don't clobber a.out

gcc -DTEST_CHDIR -g -O -W -Wall \
  chdir-long.c libcoreutils.a

vg='valgrind --track-fds=yes --leak-check=yes --quiet --num-callers=9'
vg="$vg --leak-resolution=high"

# Create a directory with name of the specified length.
# Caveat: assumes the requested length is longer than that of $TMPDIR or /tmp.
function mkdir_len
{
  local n
  case $# in 1) n=$1;; *) echo "Usage: $FUNCNAME N" 1>&2; return 1;; esac
  local root=${TMPDIR=/tmp}
  test -n "$ROOT" && root=$ROOT
  ( cd $root &&
    perl -e 'my $len='$n'-length "'$root'";$i=100;$d="z"x$i;
                  while ($i+2 < $len) {
                    $len -= $i + 1;
                    mkdir $d,0700 or die "$!\n";
                    chdir $d} $d="z"x($len-1);
                    mkdir $d or die "mkdir_len: $d: $!\n"' )
}

size_list=
pow_2=128
for i in 7 8 9 10 11 12 13 14 15 16 17; do
  n=$pow_2
  nm1=`expr $pow_2 - 1`
  np1=`expr $pow_2 + 1`
  size_list="$size_list $nm1 $n $np1"
  pow_2=`expr $pow_2 \* 2`
done

for t in . /t /tmp /var/tmp; do
  test -d $t || continue
  printf "$t\n"
  export TMPDIR=$t
  for i in `echo $size_list 99999 11`; do
    printf "$t\t$i\n"
    mkdir_len $i
    find $TMPDIR/zz*|tail -n1 > in
    tt=`echo $t|tr / -`
    # strace -o /t/k-$tt-$i ./a.out < in > out
    ./a.out < in > out
    # eval "$vg ./a.out no-pwd < in"
    rm -rf $TMPDIR/zz*
    if test "$TMPDIR" = . ; then
      (pwd|tr -d '\n'; sed 's/^\.//' in) > k; rm -f in; mv k in
    fi
    diff -u in out > diff \
      || { echo FAIL $t:$i; cut -b 1-35 diff; } \
      && rm -f diff in out
  done
done

rm -f a.out
